After Being Pierced Through the Heart by the Demon King's Sword, I Betrayed My Master.

My junior sister and I are the twin sisters of Yuyin Mountain, and we were both captured by the Demon Lord in the Demon Realm. Master War God is in seclusion. Only two senior brothers came to rescue us, but Demon Lord refused to let us go. "For the sake of the God of War, you can only take one of these two little girls away." In my desperate eyes, they chose junior sister Ruohua.